GMC Yukon XL 2000–2006
Common on this vehicle:Warning light
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Known issues4WD/AWD lamps and system inoperative: "sleepy" New Venture Gear transfer case control module (reprogram the TCCM)1
Manufacturer communication2002–2004 GMC FULLSIZE AND MIDSIZE PICKUPS AND UTILITIES (YUKON XL) ・ 2005-02-01
"Sleepy" New Venture Gear transfer case control module: reprogram the TCCM
1Fault
2Finding the cause
Not stated
3Correction
Repair
- Verify the sleepy module as the primary cause, then reprogram the TCCM with the latest software.
- Replace the module only if a C0550 DTC shows as current or in history; the reference is bulletin 02-04-21-006D.
Caution
- Do not replace the encoder motor or the transfer case.
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From the manufacturer’s document
- Applies to：Row for 2002-2004 Fullsize and Midsize Pickups and Utilities: sleepy New Venture Gear transfer case control module.
- Repair：Verify the sleepy module as the primary cause, then reprogram the TCCM with the latest software.
- Caution：Do not replace the encoder motor or the transfer case.
- Repair：Replace the module only if a C0550 DTC shows as current or in history; the reference is bulletin 02-04-21-006D.
Open this issue of GM TechLink ↗ The points above are read from an article of TechLink, GM’s monthly publication for dealership technicians. The article itself is not reproduced here.
- Remedy
- Truck Issues — Fix It Right the First Time 2002-2004 Fullsize and Midsize Pickups and Utilities – Sleepy New Venture Gear Transfer Case Control Module Verify sleepy module as primary cause. Reprogram TCCM with latest software. Don’t replace encoder motor or transfer case. Replace the module only if a C0550 DTC shows as current or in history. 02-04-21-006D